title: Complexation-tailored morphology of asymmetric block copolymer membranes.
abstract: Hydrogen-bond formation between polystyrene-b-poly (4-vinylpyridine) (PS-b-P4VP) block copolymer (BCP) and -OH/-COOH functionalized organic molecules was used to tune morphology of asymmetric nanoporous membranes prepared by simultaneous self-assembly and nonsolvent induced phase separation. The morphologies were characterized by field emmision scanning electron microscopy (FESEM) and atomic force microscopy (AFM). Hydrogen bonds were confirmed by infrared (IR), and the results were correlated to rheology characterization. The OH-functionalized organic molecules direct the morphology into hexagonal order. COOH-functionalized molecules led to both lamellar and hexagonal structures. Micelle formation in solutions and their sizes were determined using dynamic light scattering (DLS) measurements and water fluxes of 600-3200 L/m(2)·h·bar were obtained. The pore size of the plain BCP membrane was smaller than with additives. The following series of additives led to pores with hexagonal order with increasing pore size: terephthalic acid (COOH-bifunctionalized) < rutin (OH-multifunctionalized) < 9-anthracenemethanol (OH-monofunctionalized) < 3,5-dihydroxybenzyl alcohol (OH-trifunctionalized).
authors.affiliation: Water Desalination and Reuse Center, King Abdullah University of Science and Technology, 23955-6900 Thuwal, Saudi Arabia.
authors.forename: Poornima
authors.initials: P
authors.lastname: Madhavan
authors.forename: Klaus-Viktor
authors.initials: KV
authors.lastname: Peinemann
authors.forename: Suzana P
authors.initials: SP
authors.lastname: Nunes
mesh_terms: D000438:Alcohols / Q000737:chemistry; D000873:Anthracenes / Q000737:chemistry; D002625:Chemistry, Organic / Q000379:methods; D006860:Hydrogen Bonding; D008027:Light; D008567:Membranes, Artificial; D008823:Micelles; D018625:Microscopy, Atomic Force / Q000379:methods; D008855:Microscopy, Electron, Scanning / Q000379:methods; D010795:Phthalic Acids / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D012212:Rheology; D012431:Rutin / Q000737:chemistry; D012542:Scattering, Radiation; D013055:Spectrophotometry, Infrared / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013499:Surface Properties
chemical_list: D000438:Alcohols; D000873:Anthracenes; D008567:Membranes, Artificial; D008823:Micelles; D010795:Phthalic Acids; D011108:Polymers; D012431:Rutin; C011363:terephthalic acid